Python 2.7 not actually supported

[henryiii]

Using this is broken from Python 2; see https://github.com/tomerfiliba/plumbum/pull/561/checks . You are using the old egg-based setup_requires, which is deprecated and doesn't work correctly and is pulling a Python 3 only version of setuptoools-scm. The best fix would be to add universal wheels for releases and also add a pyproject.toml file.

After fixing this you can drop Python 2 support by changing the python_requires - but that should always be the first thing to change, not the last, since pip will get old versions of the package on old versions of the language, that's fine.

[henryiii]

I recommend looking over https://scikit-hep.org/developer or https://packaging.python.org/tutorials/packaging-projects/. Also, you should add this to your setup.cfg:

[bdist_wheel]
universal = 1

(And then remove it when you drop Python 2 support)